Update view in Django WITHOUT using generic classes - django

Question

I think I don't understand something fundamental here, but every single tutorial on the topic proposes a solution using either a function or a generic class, and both of them work for me, but I can't figure out how to deal with the issue using just View. So to illustrate where I am at, I am building a very simple blog and want to update data on a single post based on it's id. So what I have is:
models.py
class Post(models.Model):
title = models.CharField(max_length=100)
content = models.TextField()
author = models.CharField(max_length=100)
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse('post-detail', kwargs={'pk': self.pk})
forms.py
class PostForm(forms.ModelForm):
class Meta:
model = Post
fields = '__all__'
urls.py
urlpatterns = [
path('post/<int:pk>/update/', PostUpdateView.as_view(), name='post-update')
]
update_post.html
<form method="post">
{% csrf_token %}
{{ isolated_post.as_p }}
<input type="submit" value="Update">
</form>
and finally views.py
class PostUpdateView(View):
form_class = PostForm
initial = {'key': 'value'}
template_name = "blog/update_post.html"
def get(self, request, pk):
isolated_post = Post.objects.get(pk=pk)
form = self.form_class(instance=isolated_post)
return render(request, self.template_name, {'form': form})
def post(self, request, pk, form):
updated_post = self.form_class(request.POST, instance=form)
if updated_post.is_valid():
updated_post.save()
return HttpResponseRedirect("/post/" + f'{pk}/')
return render(request, self.template_name, {'updated_post': updated_post})
I've tried a lot of things, this time it says that form has not been passed to the post function. but the most I can achieve is the empty form, which throws out an error after I press "update". I think I just do not get the logic of "post" well enough, or how to populate the form with the one i use get function on.

Answer 1

Your view
class PostUpdateView(View):`
form_class = PostForm
template_name = "blog/update_post.html"
def setup(self, request, *args, **kwargs):
self.post_instance = get_object_or_404(Post, pk=kwargs['post_id'])
return super().setup(request, *args, **kwargs)
def get(self, request, *args, **kwargs):
post = self.post_instance
form = self.form_class(instance=post)
return render(request, self.template_name, {'form': form})
def post(self, request, *args, **kwargs):
post = self.post_instance
form = self.form_class(request.POST, instance=post)
if form.is_valid():
new_post = form.save(commit=False)
new_post.save()
return redirect('your dynamic url', post.id)